Stylus pen



FIG. 1 is a front perspective view of a stylus pen showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a side elevation view thereof;

FIG. 5 is another side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is another perspective view thereof, as shown in a user environment.

The broken lines illustrating portions of the stylus pen are for environmental purpose only and form no part of the claimed design. 

CLAIM I claim, the ornamental design for a stylus pen, as shown and described. 